package com.test.filter;

import com.test.util.Contents;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LoginFilter implements Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 过滤的内容
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;

        HttpSession session = request.getSession();
        Object userSession = session.getAttribute(Contents.USER_SESSION);
        if(userSession == null){
            //未登录
            response.sendRedirect(request.getContextPath() + "/login.jsp");
        }else{
            // 已登录 继续走
            filterChain.doFilter(servletRequest,servletResponse);
        }
    }

    public void destroy() {

    }
}
